Thanks for that guys. I have opened the boiler-something I have not done before. I think the expansion vessel is too well hidden for me. However there is a valve with 3Bar written on it. I gave this one quick one second turn-it hissed-and the pressure has not risen above 2Bar since. Did I do good or bad?
No, you just did incompetent. Before doing anything else I have to say this is not a problem to be tackled by the untrained or the unfamiliar with this type of system. At best you will mess up, at worst you will hurt yourself/someone else. Its just a wee bit complicated to deal with on a forum when you are an absolute beginner. Sorry.
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